15445666656 has 384 divisors, whose sum is σ = 54641664000. Its totient is φ = 4146412032.

The previous prime is 15445666651. The next prime is 15445666661. The reversal of 15445666656 is 65666654451.

It is an interprime number because it is at equal distance from previous prime (15445666651) and next prime (15445666661).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15445666651) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15972285 + ... + 15973251.

It is an arithmetic number, because the mean of its divisors is an integer number (142296000).

Almost surely, 2^15445666656 is an apocalyptic number.

15445666656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15445666656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27320832000).

15445666656 is an abundant number, since it is smaller than the sum of its proper divisors (39195997344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15445666656 is a wasteful number, since it uses less digits than its factorization.

15445666656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151 (or 1137 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 54.

The spelling of 15445666656 in words is "fifteen billion, four hundred forty-five million, six hundred sixty-six thousand, six hundred fifty-six".